/// <summary>
/// Handles incoming messages.
/// </summary>
/// <param name="sender">The <see cref="IMessageConnection"/> instance from which the message originated.</param>
/// <param name="message">The message.</param>
public async void HandleMessageRead(object sender, byte[] message)
{
var connection = (IMessageConnection)sender;
var code = new MessageReader <MessageCode.Peer>(message).ReadCode();
Diagnostic.Debug($"Peer message received: {code} from {connection.Username} ({connection.IPEndPoint}) (id: {connection.Id})");
try
{
switch (code)
{
case MessageCode.Peer.SearchResponse:
var searchResponse = SearchResponseSlim.FromByteArray(message);
if (SoulseekClient.Searches.TryGetValue(searchResponse.Token, out var search))
{
search.TryAddResponse(searchResponse);
}
break;
case MessageCode.Peer.BrowseResponse:
var browseWaitKey = new WaitKey(MessageCode.Peer.BrowseResponse, connection.Username);
try
{
SoulseekClient.Waiter.Complete(browseWaitKey, BrowseResponse.FromByteArray(message));
}
catch (Exception ex)
{
SoulseekClient.Waiter.Throw(browseWaitKey, new MessageReadException("The peer returned an invalid browse response", ex));
throw;
}
break;
case MessageCode.Peer.InfoRequest:
UserInfo outgoingInfo;
try
{
outgoingInfo = await SoulseekClient.Options
.UserInfoResponseResolver(connection.Username, connection.IPEndPoint).ConfigureAwait(false);
}
catch (Exception ex)
{
outgoingInfo = await new SoulseekClientOptions()
.UserInfoResponseResolver(connection.Username, connection.IPEndPoint).ConfigureAwait(false);
Diagnostic.Warning($"Failed to resolve user info response: {ex.Message}", ex);
}
await connection.WriteAsync(outgoingInfo.ToByteArray()).ConfigureAwait(false);
break;
case MessageCode.Peer.BrowseRequest:
IEnumerable <Directory> browseResponse;
try
{
browseResponse = await SoulseekClient.Options.BrowseResponseResolver(connection.Username, connection.IPEndPoint).ConfigureAwait(false);
}
catch (Exception ex)
{
browseResponse = await new SoulseekClientOptions()
.BrowseResponseResolver(connection.Username, connection.IPEndPoint).ConfigureAwait(false);
Diagnostic.Warning($"Failed to resolve browse response: {ex.Message}", ex);
}
var browseResponseMessage = new BrowseResponse(browseResponse.Count(), browseResponse);
await connection.WriteAsync(browseResponseMessage.ToByteArray()).ConfigureAwait(false);
break;
case MessageCode.Peer.FolderContentsRequest:
var folderContentsRequest = FolderContentsRequest.FromByteArray(message);
Directory outgoingFolderContents = null;
try
{
outgoingFolderContents = await SoulseekClient.Options.DirectoryContentsResponseResolver(
connection.Username,
connection.IPEndPoint,
folderContentsRequest.Token,
folderContentsRequest.DirectoryName).ConfigureAwait(false);
}
catch (Exception ex)
{
Diagnostic.Warning($"Failed to resolve directory contents response: {ex.Message}", ex);
}
if (outgoingFolderContents != null)
{
var folderContentsResponseMessage = new FolderContentsResponse(folderContentsRequest.Token, outgoingFolderContents);
await connection.WriteAsync(folderContentsResponseMessage.ToByteArray()).ConfigureAwait(false);
}
break;
case MessageCode.Peer.FolderContentsResponse:
var folderContentsResponse = FolderContentsResponse.FromByteArray(message);
SoulseekClient.Waiter.Complete(new WaitKey(MessageCode.Peer.FolderContentsResponse, connection.Username, folderContentsResponse.Token), folderContentsResponse.Directory);
break;
case MessageCode.Peer.InfoResponse:
var incomingInfo = UserInfoResponse.FromByteArray(message);
SoulseekClient.Waiter.Complete(new WaitKey(MessageCode.Peer.InfoResponse, connection.Username), incomingInfo);
break;
case MessageCode.Peer.TransferResponse:
var transferResponse = TransferResponse.FromByteArray(message);
SoulseekClient.Waiter.Complete(new WaitKey(MessageCode.Peer.TransferResponse, connection.Username, transferResponse.Token), transferResponse);
break;
case MessageCode.Peer.QueueDownload:
var queueDownloadRequest = EnqueueDownloadRequest.FromByteArray(message);
var(queueRejected, queueRejectionMessage) =
await TryEnqueueDownloadAsync(connection.Username, connection.IPEndPoint, queueDownloadRequest.Filename).ConfigureAwait(false);
if (queueRejected)
{
await connection.WriteAsync(new EnqueueFailedResponse(queueDownloadRequest.Filename, queueRejectionMessage).ToByteArray()).ConfigureAwait(false);
}
else
{
await TrySendPlaceInQueueAsync(connection, queueDownloadRequest.Filename).ConfigureAwait(false);
}
break;
case MessageCode.Peer.TransferRequest:
var transferRequest = TransferRequest.FromByteArray(message);
if (transferRequest.Direction == TransferDirection.Upload)
{
if (!SoulseekClient.Downloads.IsEmpty && SoulseekClient.Downloads.Values.Any(d => d.Username == connection.Username && d.Filename == transferRequest.Filename))
{
SoulseekClient.Waiter.Complete(new WaitKey(MessageCode.Peer.TransferRequest, connection.Username, transferRequest.Filename), transferRequest);
}
else
{
// reject the transfer with an empty reason. it was probably cancelled, but we can't be sure.
await connection.WriteAsync(new TransferResponse(transferRequest.Token, string.Empty).ToByteArray()).ConfigureAwait(false);
}
}
else
{
var(transferRejected, transferRejectionMessage) = await TryEnqueueDownloadAsync(connection.Username, connection.IPEndPoint, transferRequest.Filename).ConfigureAwait(false);
if (transferRejected)
{
await connection.WriteAsync(new TransferResponse(transferRequest.Token, transferRejectionMessage).ToByteArray()).ConfigureAwait(false);
await connection.WriteAsync(new EnqueueFailedResponse(transferRequest.Filename, transferRejectionMessage).ToByteArray()).ConfigureAwait(false);
}
else
{
await connection.WriteAsync(new TransferResponse(transferRequest.Token, "Queued.").ToByteArray()).ConfigureAwait(false);
await TrySendPlaceInQueueAsync(connection, transferRequest.Filename).ConfigureAwait(false);
}
}
break;
case MessageCode.Peer.QueueFailed:
var queueFailedResponse = EnqueueFailedResponse.FromByteArray(message);
SoulseekClient.Waiter.Throw(new WaitKey(MessageCode.Peer.TransferRequest, connection.Username, queueFailedResponse.Filename), new TransferRejectedException(queueFailedResponse.Message));
break;
case MessageCode.Peer.PlaceInQueueResponse:
var placeInQueueResponse = PlaceInQueueResponse.FromByteArray(message);
SoulseekClient.Waiter.Complete(new WaitKey(MessageCode.Peer.PlaceInQueueResponse, connection.Username, placeInQueueResponse.Filename), placeInQueueResponse);
break;
case MessageCode.Peer.PlaceInQueueRequest:
var placeInQueueRequest = PlaceInQueueRequest.FromByteArray(message);
await TrySendPlaceInQueueAsync(connection, placeInQueueRequest.Filename).ConfigureAwait(false);
break;
case MessageCode.Peer.UploadFailed:
var uploadFailedResponse = UploadFailed.FromByteArray(message);
var msg = $"Download of {uploadFailedResponse.Filename} reported as failed by {connection.Username}";
var download = SoulseekClient.Downloads.Values.FirstOrDefault(d => d.Username == connection.Username && d.Filename == uploadFailedResponse.Filename);
if (download != null)
{
SoulseekClient.Waiter.Throw(new WaitKey(MessageCode.Peer.TransferRequest, download.Username, download.Filename), new TransferException(msg));
}
Diagnostic.Debug(msg);
break;
default:
Diagnostic.Debug($"Unhandled peer message: {code} from {connection.Username} ({connection.IPEndPoint}); {message.Length} bytes");
break;
}
}
catch (Exception ex)
{
Diagnostic.Warning($"Error handling peer message: {code} from {connection.Username} ({connection.IPEndPoint}); {ex.Message}", ex);
}
}